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awk field equal something, then add something to the field

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# 8  
Old 06-17-2010
Code:
awk '$4 ~ /m/ {$2="00"$2}1' input_file

This User Gave Thanks to Scott For This Post:
jimmy_y
# 9  
Old 06-17-2010
Quote:
Originally Posted by scottn
Code:
awk '$4 ~ /m/ {$2="00"$2}1' input_file

Hi scottn,

I found that if 1.txt, each field delimiter is not " " space, but "\t", then when awk the output, all change from "\t" to " "single space. Smilie

Thanks

you can see below, the 1st row, still keep "\t", becuase does not match /m/, but other all changed from "\t" to " ".
Code:
[root@]# cat 1
a       b       c       n       e       e       e       e       e
a       b       c       m       e       e       e       e       e
a       b       c       mn      e       e       e       e       e

[root@]# awk '$4 ~ /m/ {$2="00"$2}1' 1
a       b       c       n       e       e       e       e       e
a 00b c m e e e e e
a 00b c mn e e e e e



---------- Post updated at 05:00 AM ---------- Previous update was at 04:44 AM ----------

find the answer already Smilie
Code:
awk -F"\t" 'BEGIN { OFS="\t" } $4 ~ /m/ {$2="00"$2}1' 1

# 10  
Old 06-18-2010
perl
Code:
while(<DATA>){
	s/([a-z]+\s+)([a-z]+)(\s+[a-z]+\s+)([0-9]+)/$1.(($4 eq 2)?'00':'').$2.$3.$4/e;
	print;
}
__DATA__
a b c 1 e e e e e
a b c 2 e e e e e
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